Add missing ContentType for incoming message for Spring Boot

Question

I have Spring boot app

It is receiving Json formatted messages from ActiveMQ

@Component class Receiver {
    @JmsListener(destination = "queue")
    public void receiveMessage(BusMessage message) {
        System.out.println("Received <" + message + ">");
    }

The problem, is what sometimes Json can arrive without proper header

In this case i get exception

org.springframework.messaging.converter.MessageConversionException: Cannot convert from [java.lang.String] to [cam.melexis.minipcs2socketioserver.BusMessage] for org.springframework.jms.listener.adapter.AbstractAdaptableMessageListener$MessagingMessageConverterAdapter$LazyResolutionMessage@38bd4ff9, failedMessage=org.springframework.jms.listener.adapter.AbstractAdaptableMessageListener$MessagingMessageConverterAdapter$LazyResolutionMessage@38bd4ff9

One solution can be is to get message as string and deserialise it

@Component class Receiver {
    @JmsListener(destination = "queue")
    public void receiveScannerMessage(Message message, Session session) {
        System.out.println("Received <" + message + ">");
    }

But i want to do something more graceful

To simplify all @JmsListener

And to make my learning curve in Spring more curved :)

Knowing, what all messages will arrive in Json format, can i add missing header to all incoming messages?

Or it is another "better" way exist?

Answer 1

This made a job

@EnableJms
@Configuration class JmsListenerConfig implements JmsListenerConfigurer {

 Logger logger = LoggerFactory.getLogger(Receiver.class);

 @Bean
 public DefaultMessageHandlerMethodFactory handlerMethodFactory() {
    DefaultMessageHandlerMethodFactory factory = new DefaultMessageHandlerMethodFactory();
    factory.setMessageConverter(messageConverter());
    return factory;
 }

 @Bean
 public MessageConverter messageConverter() {
    return new MappingJackson2MessageConverter();
 }

 @Override
 public void configureJmsListeners(JmsListenerEndpointRegistrar registrar) {
    registrar.setMessageHandlerMethodFactory(handlerMethodFactory());
 }
}

But i have no idea how

Maybe anybody can help me with this?